1)
Why does it say "v'Yarad"?
1.
Malbim: The border went diagonally from the north to the south (Mei Yericho).
2)
Why does it say "u'Faga bi'Yericho"?
1.
Metzudas David: The border encountered Mei Yericho (and continued to the Yarden).
2.
Bi'ur ha'Gra: When the border came close to Yericho, it returned to go east, to the Yarden.
